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1. (WO2011160516) I/Q MODEM BASED MODULATION-DEMODULATION METHOD AND EQUIPMENT

Pub. No.:    WO/2011/160516    International Application No.:    PCT/CN2011/074374
Publication Date: Dec 29, 2011 International Filing Date: May 20, 2011
IPC: H04B 1/44
Applicants: ZTE CORPORATION
中兴通讯股份有限公司
CHEN, Kanhao
陈侃浩
Inventors: CHEN, Kanhao
陈侃浩
Title: I/Q MODEM BASED MODULATION-DEMODULATION METHOD AND EQUIPMENT
Abstract:
An I/Q modem based modulation-demodulation method and equipment are provided in the present invention. The modulation method comprises: shifting the frequency spectrum of the signal to be modulated to the range greater than 0 or less than 0 (S402); using the I/Q modulator to modulate the signal to be modulated whose frequency spectrum is shifted (S404). The demodulation method comprises: shifting the frequency spectrum of the signal to be modulated to the range greater than the center frequency f0 of the signal or less than the center frequency f0 of the signal; using the I/Q demodulator to demodulate the signal to be demodulated whose frequency spectrum is shifted. With the technical solution provided by the present invention, the mirror products of the imbalance of the local oscillator amplitude and the phase are prevented from interfering with signals, and therefore the modulation-demodulation performance can be improved significantly.